Builder&#39;s appliance.



E. T. STADIG. BUILDERS APPLIANUE. APPLICATION FILED MAR. 24, 1913.

1,1 13 167, wanted 001;. 6, 1914 cfltorey UNITED STATES PiIENTl-OFFIQE,

ESAZAS T.'STADIG, OF CAMBRIDGE. MASSACHUSETTS, ASSIGNOR' OF THREE EIGHTHS TO ARTHUR W. WEEDEN, F SQMERVILLE, MASSACHUSETTS, AND ONE-FOURTH TO GEORGE JOHANSON, OF WOODLAND; MAINEL BUILDER'S APPLIANCE.

misses.

Specification oi Letters Patent.

Patentedficto 6, 19141;

Application filed March 24,1913. Serial No. 756,280.

To all whom it may concern Be it known that I, ESAIAS T. STADIG, a citizen of the United States, residing at Cambridge, in the-county of Middlesex, State of Massachusetts, have invented a "certain new and useful Improvement in Builders Appliances, of which the following is a specification, reference being-had therein to the accompanying drawings.

My invention relates to appliances intended for use by carpenters, builders, or draftsmen and is designed to assist such Workmei in the task of determining more especiall} the side-cuts for wooden rafters or similar pie es formed of steel or other structural material, as well as in other work relating to the framing of buildings and requiring angular measurements or cuts.

The object of my invention is to produce an appliance of the above character which will be capable of application to facilitate the determination of such cuts or measurements by purely graphical methods and to eliminate so far as possible the necessity for mathematical computations or geometrical processes, whether such roof be square, or of other polygonal outline.

My invention consists in an appliance which is essentially a square as commonly known in the builders trade; but having the long arm prolonged beyond the short arm or blade (hereinafter termed the tang) forming an extension arm; on which arms are carried certain scales relating to linear and angular measurements so arranged and so correlate" with respect to each other that my applia may be used as hereinafter set forth to accurately determine graphically, in a given situation, and in case of a roof of any polygonal outline the various angular and linear measurementsrelatirg to rafters or other structural pieces as hereafter set forth.

In the drawing the figure shows rgyinvention in one of its preferredembodiments.

Referring to the tigure,my appliance is made up of a preferably integral piece of suitable material, as for example brass or steel, embodying a long arm a, a short .arm or tang b, and-an extension arm,'or extenslon o; the. tang b'being perpendicular to the arm a and the extension-'0, andthe extension 0 constituting a prolongation of the arm (2. beyond the tangZI;

Inasmuch as my appliance is designed to be employed in many of its relations, either in place of, or in conjunction with, the

square commonly used by carpenters I find it to be desirable for practical reasons to adopt the followingdimensions for my appliance in one of its more popular embodi ments:" The arms a and. o are respectively 21 long and 7" long, assuming the same to extend to their point of interconnection midway of the width of the arm or tang 6. Both said arms are 19 wide;

The arm or tang Z) is 2 wide and 811; long. Thus the total length of the base of my'appliance from the end of the arm a to the end of the arm 0 is 28" and from the end of the tang b tothe outer edge of the base of my appli ance. which outer edge is the edge opposite to that from which the tang Z) projects, is 10".

The novelty of my appliance resides in the provision of certain scales which are marked upon the arms a, 7), and 0 1n the relation as hereinafter described. Upon one face of my appliance is marked a' scale P'of angle divisions converging at a center- Such angle meeting the same at the point g; such perpendieular line preferably being furnished by the edge I)" of the tang Z), and the point 9 being preferably at the corner included between the tang 7) and extension c. For

.practice of the building trade.

'I'urther convenience the divisions of the angle scale I at 45, 80, 36, 22?, 18, and 15, (the angles corresponding to the quotients obtained from a division of 180 by the number of sides, respectively, in a square, a pentagon, a hexagon, an octagon, a decagon, and a dodecagon,) are respectively extended partway across the face of the tang 7) as indicated, and in columnar arrangement upon such face of the tang b is marked respectively in correspondence with the scale division so extended figures tabulated as number of sides in polygons. To avoid a crowding of numerals in the drawing, only the angles above mentioned are illustrated in the figure but the number of the same presented upon my appliance in practice, may be increased to include spondence with a specified number of inches,

or other linear units, of rise for an assumed length of run in a jack rafter. The divisions so numbered are so located with respect to the point 9 at which the edge I) of the tang b meets the edge 0, which is.a continuation of the edge a, that the distance from the point 9 to any division of the scale N corresponding to a specified rise, is equal to the lengthof a common rafter having a run equal to the distance between the point 9 and the point a forming the center of the angle square and the specified rise.

As a result of the correlation of the scales N and P as above described, when it is desired to lay off the side cut upon a jack raf-' t'er K which isdesigned for in the construction of a roof whose plan lines correspond with the outline of a polygon, it will be found that if my appliance be laid upon the said rafter K so that the rafter edge It is in simultaneous registration with the division of scale N corresponding to the specified rise (for example 18" rise per foot in the figure) and with the point at which the edge Z) is intersected by the division of the angle scale P determined by dividing 180 by the number of sides in a polygon corresponding to the outline of the roof (C for example being such point for use in case of a hexagonal roof) the inclination of the said edge a'vvith respect to the edge k of the rafter K willcorrectly indicate the angle of the side cut for such jack rafter.

llavingdescribed my invention, and in 'what manner the same is to be performed, I

declare that what I claim is scale division corresponding to a specified rafter rise being located at a distance on the edge a from the point 9 equivalent to the length of a common rafter having arun equal to the distance between the, point 9 and the center 8 ofthe angle scale and the specified rafter rise; whereby the inclination of the said edge a with respect to the edge of a jack rafter positioned in registration with the point of intersection of a selected rafter-rise scale division and said edge a and with the point of intersection with the .said tang edge 6 of the angle scale division corresponding to the angle determined by dividing 180 by the number of sides in a polygon having the plan lines or outline of the roof for which said rafter is intended, will indicate the inclination of the side-cut for jack rafters having the specified rise in a roof of such outline. I

2. A builders appliance embodying an arm a, an arm 0 forming an extension of arm a, and a tang Z), said arm or having marked thereon a scale of rafter rise divisions arranged to-intersect a reference line carried on said arm a, said tang Z) carrying thereon a reference line lying perpendicular with respect to said first mentioned reference line and having marked thereon a scale of angle divisions described about a central point located upon the extension a, positioned upon acontinuation of the said first mentioned reference line upon the arm a, which angle divisions intersect said perpendicular reference line on tang b; the scale division corresponding to a specified rafter rise being located on the arm a at a distance from the point at which the reference line on arm a, or its continuation, is in-- tersectcd by the perpendicular reference line on the tang b, which. is equivalent to the length of a common rafter having a run equivalent to the distance between the point of intersection, just mentioned, and the oer. ter of the angle scale, and having the specified rise; whereby the inclination of the said arm a with res ect to a jack rafter positioned with its e ge in registration with I the point of intersection of a selected raftcrrise scare d1v1s1on and sald reference hne on the arm a, and with the point of intersection withthe said perpendicular reference lineon the tang b of the angle scale division cor 1,113,1e? i a,

responding to the angle determined by "1i-v In testimony whereof I affix my signziture viding 180 by the number of sides in a in presence of two Witnesses.

the roof for which said rafter is intended, v

will indicate the inclination of the side-cut "'i/ itnesses:

for jack rafters having the specified rise in a NATHAN B. DAY, roof of such outline. CHAS. F. -R'ANDALL.

polygon having the plan lines or outline of ESAIAS T. STADIG. 

